![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
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Teacher's comments：
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.box{
width: 500px;
height: 700px;
background-color: #efefef;
border: 1px solid lightgray;
margin: 20px auto;
text-align: center;
color: #636363;
box-shadow: 2px 2px 2px #999;
}
ul {
margin:0;
padding:0;
list-style-type: none;
overflow: hidden;
}
li{
float:left;
background-color: skyblue;
margin-left: 20px;
}
li a{
display: block;
width: 100px;
height: 40px;
line-height: 40px;
color: white;
text-decoration: none;
}
li a:hover{
font-size:1.2em;
background-color: red;
}
.pic{
width:450px;
height:450px;
border: 1px solid lightgray;
margin:auto;
margin-top: 50px;
}
.pic img{
width: 100%;
height:100%;
}
</style>
</head>
<body>
<div class="box">
<h2>明星相册</h2>
<ul>
<li><a href="img/zly.jpg" title="《楚乔传》,《花千骨》,《陆贞传奇》..." onclick="changePic(this);return false">赵丽颖</a></li>
<li><a href="img/gyy.jpg" title="《倚天屠龙记》,《咱们经婚吧》,《爱无悔》..." onclick="changePic(this);return false">高圆圆</a></li>
<li><a href="img/sl.jpg" title="《那年花开月正圆》,《甑环传》,《玉观音》..." onclick="changePic(this);return false">孙俪</a></li>
<li><a href="img/fbb.jpg" title="《还珠格格》,《武媚娘传奇》,《我不是潘金莲》..." onclick="changePic(this);return false">范冰冰</a></li>
</ul>
<div class="pic">
<img src="img/zwt.png" alt="" id="img">
</div>
<p id="info"></p>
</div>
<script type="text/javascript">
function changePic(pic){
var img = document.getElementById('img');
var info = document.getElementById('info');
var href = pic.href;
var title = pic.title;
var name = pic.innerHTML;
img.src = href;
img.alt = title;
info.innerHTML = '<span style="color:coral">'+name+':'+title+'</span>';
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>3.迷你计算器</title>
<style type="text/css">
.box {
width: 500px;
height: 200px;
background-color: #efefef;
border: 1px solid lightgray;
text-align: center;
margin: auto;
margin: 20px auto;
color: #636363;
border-radius: 15px;
box-shadow: 2px 2px 2px #999;
}
table {
margin: auto;
}
td {
width: 100px;
height: 30px;
padding: 5px 10px;
}
input, select {
width: 100%;
height:100%;
border:none;
text-align: center;
}
button {
width: 100%;
height: 100%;
border: none;
background-color: skyblue;
color: white;
}
button:hover {
cursor: pointer;
background-color: coral;
width: 105%;
height: 105%;
}
</style>
</head>
<body>
<div class="box">
<h2>迷你计算器</h2>
<form>
<table>
<tr>
<td><input type="text" name="opt1" placeholder="操作数1"></td>
<td>
<select name="option">
<option value="null">请选择操作</option>
<option value="add"> + </option>
<option value="sub"> - </option>
<option value="mul"> * </option>
<option value="div"> / </option>
</select>
</td>
<td><input type="text" name="opt2" placeholder="操作数2"></td>
<td><button type="button">计算</button></td>
</tr>
<tr>
<td colspan="2" align="right"><h3>结果:</h3></td>
<td colspan="2" align="left"><h3 id="placeholder"></h3></td>
</tr>
</table>
</form>
</div>
<script>
var opt1 = document.getElementsByName('opt1')[0];
var opt2 = document.getElementsByName('opt2')[0];
var opt = document.getElementsByName('option')[0];
var button = document.getElementsByTagName('button')[0];
var placeholder = document.getElementById('placeholder');
button.onclick = function(){
if (opt1.value.length == 0) {
alert('操作数1不可为空');
return false;
}else if (isNaN(opt1.value)) {
alert('操作数1必须为数字');
return false;
}else if (opt2.value.length == 0) {
alert('操作数2不可为空');
return false;
}else if (isNaN(opt2.value)) {
alert('操作数2必须为数字');
return false;
}else{
var data1 = parseFloat(opt1.value);
var data2 = parseFloat(opt2.value);
}
var temp = 0;
var option = opt.value;
switch(option){
case 'numm':
alert('请选择操作类型');
return false;
case 'add':
temp = data1 + data2;
break;
case 'sub':
temp = data1 - data2;
break;
case 'mul':
temp = data1 * data2;
break;
case 'div':
temp = data1 / data2;
break;
}
placeholder.innerHTML = temp;
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
手写代码：
ps：页面的样式基本都是对着老师的课件写的，js是自己写的。
